refactor(repo): consolidate openflare-server to root and move subprojects to internal/apps

- Merge all files inside openflare-server to the repository root directory.
- Relocate agent, relay, and flared subprojects from internal/ to internal/apps/.
- Combine docker-compose files and update build context paths to root.
- Update GitHub workflows and Dockerfiles to refer to new directories and package names.
- Rewrite Go package imports across all files.
- Resolve database renew test race condition and clean up docs.

frontend/components/providers/query-provider.tsx

@@ -0,0 +1,23 @@
+"use client"
+
+import {QueryClient, QueryClientProvider} from "@tanstack/react-query"
+import {useState} from "react"
+
+export function AppQueryProvider({ children }: { children: React.ReactNode }) {
+  const [queryClient] = useState(
+    () =>
+      new QueryClient({
+        defaultOptions: {
+          queries: {
+            staleTime: 30_000,
+            refetchOnWindowFocus: false,
+            retry: 1,
+          },
+        },
+      }),
+  )
+
+  return (
+    <QueryClientProvider client={queryClient}>{children}</QueryClientProvider>
+  )
+}